CN114495967A

CN114495967A - Method, device, communication system and storage medium for reducing reverberation

Info

Publication number: CN114495967A
Application number: CN202210150117.2A
Authority: CN
Inventors: 王翌; 马朝辉
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-05-13

Abstract

The present disclosure relates to a method, an apparatus, a communication system and a storage medium for reducing reverberation, wherein the method for reducing reverberation comprises: determining first time domain information transmitted by a first communication end and second time domain information transmitted by a second communication end, wherein the first time domain information is audio corresponding to an original sound wave, and the second time domain information is audio corresponding to a reflected sound wave of the original sound wave; determining reverberation time length according to the first time domain information and the second time domain information; and controlling the state of a high-pass filtering unit of the communication system according to the reverberation time length. According to the method, the reverberation time length of the primary wave and the reverberation time length of the reflected sound wave is determined according to the audio frequency corresponding to the primary sound wave and the audio frequency corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation time length, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio frequency can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the using effect of a user is improved.

Description

Method, device, communication system and storage medium for reducing reverberation

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method, an apparatus, a communication system, and a storage medium for reducing reverberation.

Background

After being emitted by the sound source, the sound waves are reflected by the wall-based obstacles in the room, and these reflected sound waves are called echoes. When a sound source stops sounding, sound waves are reflected and absorbed for many times in a room and disappear at last, and people feel that a plurality of sound waves are mixed for a period of time after the sound source stops sounding, the sound continuation phenomenon still existing after the sound source stops sounding is generally called reverberation, and the period of time is called reverberation time.

For a scene aiming at voice communication, the longer reverberation time affects the definition of voice and reduces the recognition rate of a voice recognition system.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a method, an apparatus, a communication system, and a storage medium for reducing reverberation.

According to a first aspect of the embodiments of the present disclosure, there is provided a method for reducing reverberation, applied to a communication system including a first communication terminal and a second communication terminal, the method including:

determining first time domain information transmitted by a first communication end and second time domain information transmitted by a second communication end, wherein the first time domain information is audio corresponding to an original sound wave, and the second time domain information is audio corresponding to a reflected sound wave of the original sound wave;

determining reverberation time length according to the first time domain information and the second time domain information;

and controlling the state of a high-pass filtering unit of the communication system according to the reverberation time length.

Optionally, the controlling the state of a high-pass filtering unit of the communication system according to the reverberation time length includes:

and when the high-pass filtering unit is in a non-working state, if the reverberation time length is greater than or equal to a first set time length, controlling the high-pass filtering unit to enter a working state.

and when the high-pass filtering unit is in a working state, if the reverberation time length is less than a second set time length, controlling the high-pass filtering unit to enter a non-working state.

Optionally, the determining the reverberation time length according to the first time domain information and the second time domain information includes:

respectively processing the first time domain information and the second time domain information, and determining first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information;

within a set frequency band, calculating the difference of the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determining the difference value corresponding to each frequency point;

summing all the difference values to determine a sum value;

and determining the reverberation time length according to configuration information and the sum, wherein the configuration information represents the mapping relation between the sum and the reverberation time length.

Optionally, the separately processing the first time domain information and the second time domain information to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information includes:

and respectively and sequentially carrying out Fourier transform, modulus processing and normalization processing on the first time domain information and the second time domain information so as to determine the first frequency domain information and the second frequency domain information.

Optionally, the set frequency band includes a frequency band less than or equal to 500 Hz.

Optionally, the method further comprises:

and when the high-pass filtering unit is in a non-working state, if first control information for controlling the high-pass filtering unit to enter a working state is received, controlling the high-pass filtering unit to enter the working state.

Optionally, the method further comprises:

and when the high-pass filtering unit is in a working state, if second control information for controlling the high-pass filtering unit to enter a non-working state is received, controlling the high-pass filtering unit to enter the non-working state.

According to a second aspect of the embodiments of the present disclosure, there is provided an apparatus for reducing reverberation, applied to a communication system including a first communication terminal and a second communication terminal, the apparatus including:

the device comprises a determining module, a processing module and a processing module, wherein the determining module is used for determining first time domain information transmitted by a first communication terminal and second time domain information transmitted by a second communication terminal, the first time domain information is audio corresponding to an original sound wave, and the second time domain information is audio corresponding to a reflected sound wave of the original sound wave;

the first time domain information and the second time domain information are used for determining the reverberation time length;

and the control module is used for controlling the state of a high-pass filtering unit of the communication system according to the reverberation time length.

Optionally, the control module is configured to:

Optionally, the determining module is configured to:

summing all the difference values to determine a sum value;

Optionally, the determining module is configured to:

Optionally, the control module is further configured to:

According to a third aspect of the embodiments of the present disclosure, there is provided a communication system including:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to perform the method of the first aspect.

According to a fourth aspect of embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium having instructions therein, which when executed by a processor of a communication system, enable the communication system to perform the method of the first aspect.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: according to the method, the reverberation time length of the primary wave and the reverberation time length of the reflected sound wave is determined according to the audio frequency corresponding to the primary sound wave and the audio frequency corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation time length, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio frequency can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the using effect of a user is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a flow diagram illustrating a method of reducing reverberation according to an exemplary embodiment.

Fig. 2 is a flow diagram illustrating a method of reducing reverberation according to an exemplary embodiment.

Fig. 3 is a block diagram illustrating an apparatus for reducing reverberation according to an exemplary embodiment.

Fig. 4 is a schematic diagram of a communication system shown in accordance with an example embodiment.

Fig. 5 is a block diagram illustrating a communication system in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosure, as detailed in the appended claims.

In the related art, in a voice communication scene, particularly a conference communication system is taken as a representative, and dereverberation is mainly realized by a dereverberation algorithm. However, the dereverberation algorithm in the related art has difficulty in accurately separating the desired direct sound and early reflected sound (beneficial to listening) from late reflected sound, and if the dereverberation intensity is too high, the voice is damaged, and if the dereverberation intensity is too low, the dereverberation effect is not good. In addition, the dereverberation algorithm may be affected by noise and the like, and is poor in effect.

The present disclosure provides a method for reducing reverberation, which is applied to a communication system. According to the method, the reverberation time length of the primary wave and the reverberation time length of the reflected sound wave is determined according to the audio frequency corresponding to the primary sound wave and the audio frequency corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation time length, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio frequency can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the using effect of a user is improved.

In one exemplary embodiment, a method for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. The first communication terminal 1 and the second communication terminal 2 may be the same or different, and are not limited thereto. In addition, the method mainly takes the example of transmitting the voice of the first communication terminal 1 to the second communication terminal 2 for description. As for the method of transmitting the voice of the second communication terminal 2 to the first communication terminal 1, reference may be made to the method of transmitting the voice of the first communication terminal 1 to the second communication terminal 2, which is not described herein again.

Referring to fig. 1, the method includes:

s110, acquiring first time domain information transmitted by a first communication end and second time domain information of a second communication end, wherein the first time domain information is audio corresponding to an original sound wave, and the second time domain information is audio corresponding to a reflected sound wave of the original sound wave;

s120, determining reverberation time length according to the first time domain information and the second time domain information;

and S130, controlling the state of the high-pass filtering unit according to the reverberation time length.

In step S110, the communication system may include the information processing unit 3. The first communication terminal 1 may comprise a first audio input 11 and a first audio output 12. The second communication terminal 2 may comprise a second audio input 21 and a second audio output 22. The audio input by the first audio input terminal 11 can be output by the second audio output terminal 22 after passing through the information processing unit 3, and the audio input by the second audio input terminal 21 can be output by the first audio output terminal 12 after passing through the information processing unit 3, so that the voice communication between the user of the first communication terminal 1 and the user of the second communication terminal 2 is realized. The first audio input 11 and the second audio input 21 may comprise a microphone or the like for capturing audio, and the first audio output 12 and the second audio output 22 may comprise a speaker or the like for playing audio.

After the audio corresponding to the native wave is input into the first audio input terminal 11, the first audio input terminal 11 can receive the first time domain information, and then transmit the first time domain information to the information processing unit 3, and the information processing unit 3 can receive the first time domain information transmitted by the first communication terminal 1.

The information processing unit 3 transmits the first time domain information to the second audio output terminal 22, and the second audio output terminal 22 can output the audio corresponding to the first time domain information.

After the second audio output terminal 22 outputs the audio, the audio corresponding to the reflected sound wave can be generated in the environment where the second communication terminal 2 is located, the second audio input terminal 21 can receive the audio (i.e. the second time domain information) corresponding to the reflected sound wave, and then transmit the audio to the information processing unit 3, and the information processing unit 3 can receive the second time domain information.

It should be noted that the second time domain information includes audio corresponding to the sound wave output by the second audio output end 22 and audio corresponding to the reflected sound wave generated by the sound wave in the environment where the second communication end 2 is located, that is, the sound wave output by the second audio output end 22 and the reflected sound wave generated by the sound wave in the environment where the second communication end 2 is located, which are referred to as the reflected sound wave of the native wave input by the first audio input end 11.

In the process of continuous communication between the first communication terminal 1 and the second communication terminal 2, the audio received by the information processing unit 3 includes first time domain information and second time domain information. The information processing unit 3 may extract the first time domain information and the second time domain information from the received audio based on a VAD (Voice Activity Detection, VAD, also called Voice endpoint Detection or Voice boundary Detection) technique, so that the information processing unit 3 may determine the first time domain information transmitted by the first communication terminal 1 and the second time domain information transmitted by the second communication terminal 2.

It should be noted that, in the process of communicating between the first communication terminal 1 and the second communication terminal 2, the second audio input terminal 21 may also input audio corresponding to the native wave, and in general, the native wave input by the second audio input terminal 21 is different from that input by the first audio input terminal 11. The audio corresponding to the native wave transmitted from the second audio input terminal 21 to the information processing unit 3 can be recorded as the third time domain information. Meanwhile, the information processing unit 3 may transmit the third time domain information to the first audio output end 12, and the first audio output end 12 may belong to an audio corresponding to the third time domain information. The audio output by the first audio output end 12 can generate an audio corresponding to the reflected sound wave in the environment where the first communication end 1 is located, the first audio input end 11 can receive the audio corresponding to the reflected sound wave (which can be recorded as fourth time domain information), and then transmit the audio to the information processing unit 3, and the information processing unit 3 can receive the fourth time domain information.

That is, generally, the audio received by the information processing unit 3 includes first time domain information, second time domain information, third time domain information, and fourth time domain information. The information processing unit 3 can extract the first time domain information, the second time domain information, the third time domain information and the fourth time domain information from the received audio based on the VAD technique, so that the information processing unit 3 can determine the first time domain information transmitted by the first communication terminal 1 and the second time domain information transmitted by the second communication terminal 2.

In addition, taking the first communication terminal 1 as an example, the user can input the first time domain information at the first audio input terminal 11 by making a voice at the first audio input terminal 11, so that the first audio input terminal 11 receives the audio corresponding to the native wave. The user may speak to make a voice, or may speak via other voice devices, which is not limited to this.

In step S120, after the first time domain information and the second time domain information corresponding to each other are determined, the reverberation time length can be determined based on the first time domain information and the second time domain information, so as to determine whether the filtering process is required according to the reverberation time length in the following step.

It should be noted that, the audio frequency corresponding to the native wave is recorded as first time domain information, and the audio frequency corresponding to the reflected sound wave of the native wave is recorded as second time domain information, so that it can be considered that the first time domain information and the second time domain information correspond to each other.

In step S130, the state of the high-pass filtering unit may be controlled based on the size of the reverberation period. In general, when the reverberation time reaches a certain time, the reverberation is more serious, and the user can feel the influence of the reverberation. Therefore, in this step, the state of the high-pass filtering unit may be controlled based on the magnitude relation between the reverberation period and the set period (e.g., the above-described certain period).

The state of the high-pass filtering unit may include an operating state and a non-operating state. When the high-pass filtering unit is in a non-working state, the high-pass filtering unit does not process the audio passing through the high-pass filtering unit, and the audio can pass through the high-pass filtering unit directly. When the high-pass filtering unit is in a working state, the high-pass filtering unit carries out filtering processing on the audio frequency passing through the high-pass filtering unit so as to filter the low-frequency part of the audio frequency, and therefore the purpose of reducing the low-frequency reverberation is achieved.

In case 1, the high-pass filtering unit is in a non-operating state.

In case 1, if the reverberation time length is less than the first set time length, it indicates that the reverberation time length is small, the influence of the reverberation on the user is small, and the processing for eliminating the reverberation is not required, so that the high-pass filtering unit can be controlled to continue to be kept in the non-working state. When the reverberation period is zero, it can be considered that no reverberation exists.

In case 1, if the reverberation time length is greater than or equal to the first set time length, it indicates that the reverberation time length is too large and the reverberation is relatively serious, and the high-pass filtering unit may be controlled to enter a working state.

When the high-pass filtering unit is in an operating state, the audio (e.g. the first time domain information) sent by the information processing unit 3 needs to be filtered by the high-pass filtering unit before being transmitted to the second audio output terminal 22 of the second communication terminal 2, and then being output by the second audio output terminal 22. Because the audio output by the second audio output terminal 22 has been subjected to the filtering processing by the high-pass filtering unit, it can be well avoided that the second communication terminal 2 generates reverberation, or even if the second communication terminal 2 generates reverberation, the reverberation time is relatively short, so that the user cannot be substantially affected, and the user experience can be well ensured.

In addition, in case 1, the high-pass filtering unit may be controlled to enter the operating state if first control information for controlling the high-pass filtering unit to enter the operating state is received. And if second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit does not act so as to keep the high-pass filtering unit in the non-working state continuously.

For example, when the high-pass filtering unit is in the non-operating state, the user may input the first control information to the information processing unit 3, and after the information processing unit 3 receives the first control information, the high-pass filtering unit may be controlled to enter the operating state.

In case 2, the high-pass filtering unit is in a non-operating state.

In case 1, if the reverberation time length is greater than or equal to the second set time length, it indicates that even if the high-pass filtering unit is in the working state, the reverberation time length is still large, and the reverberation is still serious, and the high-pass filtering unit can be controlled to continue to maintain the working state. And based on the judgment result that the reverberation time length is greater than or equal to the second set time length, the user can be reminded to check the whole communication system to determine the reason of the reverberation, so that corresponding measures are taken to eliminate or reduce the influence of the reverberation.

In case 2, if the reverberation time length is less than the second set time length, it indicates that the reverberation time length is very small, the influence of the reverberation on the user is very small, and the processing for eliminating the reverberation is not required, and the high-pass filtering unit can be controlled to continue to enter the non-operating state, so as to reduce the power consumption of the communication system.

In this step, when the reverberation time is very short, the high-pass filtering unit is in a non-working state, and it can be well ensured that the second communication terminal 2 receives complete first time domain information, so that the effect of the audio output by the second communication terminal 2 is improved, and the user experience is improved.

In case 2, when the first control information for controlling the high-pass filter unit to enter the operating state is received, the high-pass filter unit is not operated so as to be kept in the operating state. And if second control information for controlling the high-pass filtering unit to enter the non-working state is received, the high-pass filtering unit can be controlled to enter the non-working state.

For example, the user may input the second control information to the information processing unit 3, and the information processing unit 3 may control the high-pass filtering unit to enter the working state after receiving the second control information.

It should be noted that the reverberation duration determined when the high-pass filtering unit is in the operating state is generally longer than the reverberation duration determined when the high-pass filtering unit is in the non-operating state, and therefore, in the method, the second set duration may be set to be shorter than the first set duration, so as to avoid frequent switching of the high-pass filtering unit between the operating state and the non-operating state. For example, the first set time period may be set to 1.1s, and the second set time period may be set to 0.9 s.

According to the method, the reverberation time length of the primary wave and the reverberation time length of the reflected sound wave is determined according to the audio frequency corresponding to the primary sound wave and the audio frequency corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation time length, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio frequency can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the using effect of a user is improved.

It should be noted that the high-pass filtering unit may include a first high-pass filtering unit 4 and a second high-pass filtering unit 5. The first high-pass filtering unit 4 is used to reduce or even eliminate reverberation of the first communication terminal 1, and may be located between the information processing unit 3 and the first audio output terminal 12, or between the information processing unit 3 and the second audio input terminal 21. The second high-pass filtering unit 5 for reducing or even eliminating reverberation at the second communication terminal 2 may be located between the information processing unit 3 and the second audio output terminal 22, or between the information processing unit 3 and the first audio input terminal 11.

In the case of example 1, the following examples,

the communication system is a voice communication system comprising an information processing unit 3, a control unit 6, a first audio input 11, a first audio output 12, a second audio input 21, a second audio output 22, a first high-pass filtering unit 4 and a second high-pass filtering unit 5. The first high-pass filtering unit 4 is located between the information processing unit 3 and the first audio output terminal 12, and the second high-pass filtering unit 5 is located between the information processing unit 3 and the second audio output unit. The first audio input 11 and the first audio output 12 form a first communication terminal 1, and the second audio output 22 form a second communication terminal 2. The first user is located at the first communication terminal 1, and the second user is located at the second communication terminal 2.

When a first user speaks at the first communication terminal 1, the first audio input terminal 11 can acquire a voice uttered by the first user, where the voice is an audio corresponding to the first acoustic wave and is recorded as first time domain information. The first audio input 11 can transmit the first time domain information to the information processing unit 3, then the information processing unit 3 transmits the first time domain information to the second high-pass filtering unit 5, and then the second high-pass filtering unit 5 transmits the first time domain information to the second audio output 22, and the second audio output 22 plays audio.

The audio transmission process from the first audio output terminal 11 to the second audio output terminal 22 can be shown by the dashed arrow in fig. 4.

After the second audio output end 22 plays the audio, the audio corresponding to the first reflected sound wave of the first primary wave can be generated in the environment where the second communication end 2 is located, and the audio corresponding to the first reflected sound wave can be collected by the second audio input end 21 and recorded as the second time domain information. The second audio input 21 may transmit the second time domain information to the information processing unit 3.

When the second user speaks at the second communication terminal 2, the second audio input terminal 21 can acquire the voice uttered by the second user, and the voice is an audio corresponding to the second acoustic wave and is recorded as the third time domain information. The second audio input terminal 21 may transmit the third time domain information to the information processing unit 3, and then the information processing unit 3 transmits the third time domain information to the first high-pass filtering unit 4, and then the first high-pass filtering unit 4 transmits the third time domain information to the first audio output terminal 12, and the first audio output terminal 12 plays the audio.

The audio transmission process from the second audio output terminal 21 to the first audio output terminal 12 can be illustrated with reference to the dotted arrow in fig. 4.

After the first audio output end 13 plays the audio, the audio corresponding to the second reflected sound wave of the second primary wave can be generated in the environment where the first communication end 1 is located, and the first audio input end 11 can acquire the audio corresponding to the second reflected sound wave and record the audio as the fourth time domain information. The first audio input 11 may transmit the fourth time domain information to the information processing unit 3.

In the process of communicating between the first user and the second user through the communication system, the information processing unit 3 may extract the first time domain information, the second time domain information, the third time domain information, and the fourth time domain information from the received audio based on the VAD technique. And may determine a first reverberation duration based on the first time domain information and the second time domain information and a second reverberation duration based on the third time domain information and the fourth time domain information.

When the first high-pass filtering unit 4 is in the non-operating state, if the second reverberation time length is less than the first set time length (for example, 1.1s), which indicates that the audio heard by the first user is less affected by the reverberation or the reverberation is not affected, the information processing unit 3 may not operate, and the first high-pass filtering unit 4 continues to be in the non-operating state; if the second reverberation time length is greater than or equal to the first set time length, which indicates that the audio heard by the first user is greatly influenced by reverberation, the information processing unit 3 may send first feedback information to the control unit 6, and the control unit 6 may control the first high-pass filtering unit 4 to enter a working state based on the first feedback information.

When the first high-pass filtering unit 4 is in the working state, if the second reverberation time length is less than the second set time length (for example, 0.9s), which indicates that the audio heard by the first user is less affected by the reverberation or the reverberation is not affected, the information processing unit 3 may send second feedback information to the control unit 6, and the control unit 6 may control the first high-pass filtering unit 4 to enter the non-working state based on the second feedback information; if the second reverberation duration is greater than or equal to the second set duration, which indicates that the audio heard by the first user is greatly influenced by the reverberation, the information processing unit 3 may not act, so that the first high-pass filtering unit 4 continues to be kept in the working state.

When the second high-pass filtering unit 5 is in the non-operating state, if the first reverberation duration is less than the first set duration (for example, 1.1s), which indicates that the audio heard by the second user is less affected by the reverberation or the reverberation is not affected, the information processing unit 3 may not act, and the second high-pass filtering unit 5 continues to be in the non-operating state; if the first reverberation time length is greater than or equal to the first set time length, which indicates that the audio heard by the second user is greatly influenced by reverberation, the information processing unit 3 may send third feedback information to the control unit 6, and the control unit 6 may control the second high-pass filtering unit 5 to enter a working state based on the third feedback information.

When the second high-pass filtering unit 5 is in an operating state, if the first reverberation duration is less than a second set duration (for example, 0.9s), which indicates that the audio heard by the second user is less affected by reverberation or is not affected by reverberation, the information processing unit 3 may send fourth feedback information to the control unit 6, and the control unit 6 may control the second high-pass filtering unit 5 to enter a non-operating state based on the fourth feedback information; if the first reverberation time length is greater than or equal to the second set time length, which indicates that the audio heard by the second user is greatly influenced by reverberation, the information processing unit 3 may not act, so that the second high-pass filtering unit 5 continues to be in the working state.

The information processing unit 3 controls the transmission flow of the information of the first high-pass filtering unit and the second high-pass filtering unit through the control unit 4 as shown by the implementation arrows in fig. 4.

In example 1, reverberation durations of the primary wave and the reflected sound wave are determined according to the audio corresponding to the primary sound wave and the audio corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation durations, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the communication effect between the first user and the second user can be better ensured.

In addition, in this example 1, the information processing unit 3 can control the states of the first high-pass filtering unit 4 and the second high-pass filtering unit 5 by the control unit 6, respectively, and the degree of refinement to reduce reverberation is high.

It should be noted that the information processing unit 3 can control the first high-pass filtering unit 4 and the second high-pass filtering unit 5 to be in the same state through the control unit 6.

In the case of example 2, the following example was carried out,

this example 2 is the same in structure as the communication system of example 1. This example 2 differs from example 1 in that, in this example 2, the states of the first high-pass filter unit 4 and the second high-pass filter unit 5 are the same. That is, the first high-pass filter unit 4 and the second high-pass filter unit 5 are both in an operating state, or are both in a non-operating state.

In this example 2, when the first high-pass filtering unit 4 and the second high-pass filtering unit 5 are both in the non-operating state, if the second reverberation period is less than the first set period (for example, 1.1s), and the first reverberation period is greater than or equal to the first set period, the information processing unit 3 may not operate, and the first high-pass filtering unit 4 and the second high-pass filtering unit 5 continue to be in the non-operating state; if at least one of the first reverberation time length and the second reverberation time length is greater than or equal to the first set time length, the information processing unit 3 can send fifth feedback information to the control unit 6, and the control unit 6 can control the first high-pass filtering unit 4 and the second high-pass filtering unit 5 to enter a working state based on the fifth feedback information.

When the first high-pass filtering unit and the second high-pass filtering unit 5 are both in a working state, if at least one of the first reverberation time length and the second reverberation time length is smaller than a second set time length (for example, 0.9s), the information processing unit 3 can send second feedback information to the control unit 6, and the control unit 6 can control the first high-pass filtering unit 4 and the second high-pass filtering unit 5 to both enter a non-working state based on sixth feedback information; if the second reverberation time length is greater than or equal to the second set time length and the first reverberation time length is greater than or equal to the second set time length, the information processing unit 3 may not act, so that both the first high-pass filtering unit 4 and the second high-pass filtering unit 5 are continuously kept in the working state.

In this example 2, the reverberation duration of the primary wave and the reverberation duration of the reflected sound wave are determined according to the audio corresponding to the primary sound wave and the audio corresponding to the reflected sound wave of the primary sound wave, and then the state of the high-pass filtering unit is controlled according to the reverberation duration, so that the reverberation removing strength is more appropriate, the reverberation removing effect can be ensured, the audio can be prevented from being damaged, the influence of noise on the reverberation removing can be avoided, and the communication effect between the first user and the second user can be better ensured.

In addition, in this example 2, the information processing unit 3 synchronously controls the first high-pass filtering unit 4 and the second high-pass filtering unit 5 by the control unit 6, and the control process is simpler.

Referring to fig. 2, in the method, determining the reverberation period according to the first time domain information and the second time domain information may include:

s210, the first time domain information and the second time domain information are respectively processed, and first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information are determined;

s220, in a set frequency band, calculating the difference of the corresponding amplitude values of each frequency point in the first frequency domain information and the second frequency domain information, and determining the difference value corresponding to each frequency point;

s230, summing all the difference values to determine a sum value;

and S240, determining the reverberation time length according to the configuration information and the sum, wherein the configuration information represents the mapping relation between the sum and the reverberation time length.

In step S210, fourier transform, modulo processing, normalization processing, and the like may be performed on the first time domain information in sequence to obtain first frequency domain information. The first frequency domain information comprises a plurality of frequency points and amplitude values corresponding to each frequency point.

The second time domain information may be subjected to fourier transform, modulo processing, normalization processing, and the like in sequence to obtain second frequency domain information. The second frequency domain information also includes a plurality of frequency points and a corresponding amplitude value of each frequency point.

In step S220, the set frequency band may be set before the communication system leaves the factory, or may be set after the communication system leaves the factory, and in addition, after the set frequency band is set, the set frequency band may be subsequently modified, so as to better meet different requirements of the user.

The set frequency band is set according to actual requirements, which is not limited. The set frequency band may exemplarily comprise a low frequency band, for example, a frequency band less than or equal to 500 Hz. That is, the set frequency band may be a frequency band greater than or equal to 0Hz and less than or equal to 500 Hz. In addition, the set band may be a full band.

It should be noted that the number of frequency points in the frequency band is set, and is related to the sampling rate of the first time domain information and the sampling time interval. In general, the greater the number of frequency points in the set frequency band, the higher the reliability of the method.

In this step, the amplitude corresponding to each frequency point in the frequency band may be determined in the first frequency domain information. And determining the amplitude corresponding to each frequency point in the set frequency band in the second frequency domain information. The amplitude corresponding to the information of the frequency point in the first frequency domain can be recorded as a first amplitude of the frequency point, the amplitude corresponding to the information of the frequency point in the second frequency domain can be recorded as a second amplitude of the frequency point, and the difference between the first amplitude and the second amplitude can be recorded as a difference corresponding to the frequency point. Based on the above manner, the difference value corresponding to each frequency point in the set frequency band can be determined.

In step S230, the sum of all the differences may be obtained by summing all the differences. The sum value may be used to reflect the reverberation duration. In general, the larger the sum, the longer the reverberation period.

In step S240, the configuration information may be set before the communication system leaves the factory, or may be set after the communication system leaves the factory, and in addition, after the configuration information is set, the configuration information may be subsequently modified, so as to better meet different requirements of the user. The specific content of the configuration information may be determined experimentally.

The mapping relationship between the configuration information and the value and the reverberation time length may be a relational curve or a relational expression, or may be information in other forms, which is not limited herein. Wherein, the sum value is positively correlated with the reverberation time length, that is, the larger the sum value is, the larger the reverberation time length is.

For example, the configuration information is a characterization sum value versus reverberation duration. After the sum is determined, the reverberation duration corresponding to this sum can be found from the relationship curve.

As another example, the configuration information is a characterization sum value versus reverberation duration. After the sum is determined, the sum can be substituted into the relation, and the reverberation time length corresponding to the sum can be calculated.

According to the method, the configuration information of the characteristic sum and the reverberation time length can be preset in the communication system, and then the reverberation time length is estimated based on the configuration information, and the first frequency domain information corresponding to the first time domain information and the second frequency domain information corresponding to the second time domain information, so that reliable data are provided for controlling the high-pass filtering unit based on the reverberation time length subsequently, the reliability of the method is improved, and the use experience of a user is further improved.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. The first communication terminal 1 and the second communication terminal 2 may be the same or different, and are not limited thereto.

The apparatus is used for implementing the method described above and, for example, as shown in fig. 3, may include a determination module 101 and a control module 102, and in implementing the method described above,

the determining module 101 is configured to determine first time domain information transmitted by the first communication terminal 1 and second time domain information transmitted by the second communication terminal 2, where the first time domain information is an audio frequency corresponding to an original sound wave, and the second time domain information is an audio frequency corresponding to a reflected sound wave of the original sound wave;

and the control module 102 is configured to control a state of the high-pass filtering unit according to the reverberation time length.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. Referring to fig. 3, in the apparatus, the control module 102 is configured to:

and under the condition that the high-pass filtering unit is in a non-working state, if the reverberation time length is greater than or equal to a first set time length, controlling the high-pass filtering unit to enter a working state.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, i.e. the communication system may be a system for enabling voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. Referring to fig. 3, in the apparatus, a determining module 101 is configured to:

summing all the difference values to determine a sum value;

and determining the reverberation time length according to the configuration information and the sum, wherein the configuration information represents the mapping relation between the sum and the reverberation time length.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. Referring to fig. 3, in the apparatus, the determining module is configured to:

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. In the device, the set frequency band comprises a frequency band less than or equal to 500 Hz.

In one exemplary embodiment, an apparatus for reducing reverberation is provided for use in a communication system. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. Referring to fig. 3, in the apparatus, the control module 102 is further configured to:

and when the high-pass filtering unit is in a non-working state, if first control information for controlling the high-pass filtering unit to enter a working state is received, the high-pass filtering unit is controlled to enter the working state.

In one exemplary embodiment, an apparatus for reducing reverberation for use in a communication system is provided. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. Referring to fig. 3, in the apparatus, the control module 102 is further configured to:

and when the high-pass filtering unit is in a working state, if second control information for controlling the high-pass filtering unit to enter a non-working state is received, the high-pass filtering unit is controlled to enter the non-working state.

In one exemplary embodiment, a communication system is provided. The communication system may be a voice communication system, that is, the communication system may be a system for realizing voice communication. Referring to fig. 4, a communication system may include a first communication terminal 1 and a second communication terminal 2. The first communication terminal 1 and the second communication terminal 2 may be the same or different, and are not limited thereto.

Referring to fig. 5, a communication system 400 may include one or more of the following components: processing components 402, memory 404, power components 406, multimedia components 408, audio components 410, input/output (I/O) interfaces 412, sensor components 414, and communication components 416.

The processing component 402 generally controls the overall operation of the communication system 400, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 402 may include one or more processors 420 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 402 can include one or more modules that facilitate interaction between the processing component 402 and other components. For example, the processing component 402 can include a multimedia module to facilitate interaction between the multimedia component 408 and the processing component 402.

The memory 404 is configured to store various types of data to support operation at the communication system 400. Examples of such data include instructions for any application or method operating on communication system 400, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 404 may be implemented by any type or combination of volatile or non-volatile memory communication systems, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The power component 406 provides power to the various components of the communication system 400. Power components 406 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for communication system 400.

The multimedia component 408 includes a screen that provides an output interface between the communication system 400 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 408 includes a front camera application and/or a rear camera application. The front camera application and/or the back camera application may receive external multimedia data when the communication system 400 is in an operating mode, such as a shooting mode or a video mode. Each front camera application and back camera application may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 410 is configured to output and/or input audio signals. For example, audio component 410 includes a Microphone (MIC) configured to receive external audio signals when communication system 400 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 404 or transmitted via the communication component 416. In some embodiments, audio component 410 also includes a speaker for outputting audio signals.

The I/O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor component 414 includes one or more sensors for providing various aspects of state assessment for the communication system 400. For example, the sensor component 414 can detect an open/closed state of the communication system 400, the relative positioning of components, such as a display and keypad of the communication system 400, the sensor component 414 can also detect a change in the position of the communication system 400 or a component of the communication system 400, the presence or absence of user contact with the communication system 400, the orientation or acceleration/deceleration of the communication system 400, and a change in the temperature of the communication system 400. The sensor assembly 414 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 416 is configured to facilitate communications between the communication system 400 and other communication systems in a wired or wireless manner. The communication system 700 may access wireless networks based on communication standards such as WiFi, 2G, 3G, 4G, 5G, or combinations thereof. In an exemplary embodiment, the communication component 416 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 416 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the communication system 400 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), digital signal processing communication systems (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 404 comprising instructions, executable by the processor 420 of the communication system 400 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage communication system, and the like. The instructions in the storage medium, when executed by a processor of the communication system, enable the communication system to perform the methods shown in the above embodiments.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for reducing reverberation for use in a communication system including a first communication end and a second communication end, the method comprising:

2. The method of claim 1, wherein controlling the state of a high-pass filtering unit of the communication system according to the reverberation time duration comprises:

3. The method of claim 1, wherein controlling the state of a high-pass filtering unit of the communication system according to the reverberation time duration comprises:

4. The method of any of claims 1-3, wherein determining the reverberation time duration based on the first time domain information and the second time domain information comprises:

summing all the difference values to determine a sum value;

5. The method of claim 4, wherein the separately processing the first time domain information and the second time domain information to determine first frequency domain information corresponding to the first time domain information and second frequency domain information corresponding to the second time domain information comprises:

6. The method of claim 4, wherein the set frequency band comprises a frequency band less than or equal to 500 Hz.

7. The method according to any one of claims 1-3, further comprising:

8. The method according to any one of claims 1-3, further comprising:

9. An apparatus for reducing reverberation for use in a communication system including a first communication terminal and a second communication terminal, the apparatus comprising:

10. The apparatus of claim 9, wherein the control module is configured to:

11. The apparatus of claim 9, wherein the control module is configured to:

12. The apparatus of any one of claims 9-11, wherein the determining module is configured to:

summing all the difference values to determine a sum value;

13. The apparatus of claim 12, wherein the determining module is configured to:

14. The apparatus of claim 12, wherein the set frequency band comprises a frequency band less than or equal to 500 Hz.

15. The apparatus of any of claims 9-11, wherein the control module is further configured to:

16. The apparatus of any of claims 9-11, wherein the control module is further configured to:

17. A communication system, the communication system comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to perform the method of any one of claims 1-8.

18. A non-transitory computer readable storage medium, wherein instructions in the storage medium, when executed by a processor of a communication system, enable the communication system to perform the method of any of claims 1-8.